Place potatoes in the bottom of baking dish large enough to hold chops without crowding.
Place chops on top.
Separate onion slices into rings; place over chops.
Combine sour cream and dry mustard, pour over all.
Cover pan with foil and bake at 350 for 1 1/2 hours.
Remove foil from pan and bake a little longer until top is nicely browned.
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